Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
85.7
73
95
91
95
99
February
90.5
80
93
97
94
99
March
94.2
99
90
98
97
93
April
98.1
96
99
98
99
98
May
99.1
99
98
99
100
June
99.4
100
96
100
99
July
99.4
97
100
100
100
August
94.1
80
100
97
100
September
91.0
97
98
90
73
October
98.5
100
100
99
97
November
92.7
87
85
95
98
December
87.0
82
82
94
94
Average
93.9
87.2
93.4
95.7
96.8
95.9
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
7.1
6
8
10
9
9
February
8.7
10
10
12
8
11
March
11.8
13
9
15
13
12
April
16.2
16
16
14
19
18
May
22.0
23
20
22
22
June
26.9
28
26
30
25
July
32.6
33
34
35
31
August
31.9
32
34
31
32
September
25.8
25
28
27
29
October
18.9
20
23
18
22
November
11.4
11
9
14
12
December
6.8
10
3
7
8
Average
17.5
11.2
18.7
19.3
19.3
19.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-4.9
-3
-3
-3
-2
0
February
-4.2
-1
-4
-5
-4
-4
March
-3.9
-2
-3
0
-3
-3
April
0.3
-1
1
-1
-1
1
May
4.6
6
3
4
4
June
7.9
8
9
10
8
July
10.4
11
12
12
9
August
10.4
12
12
10
10
September
6.1
7
7
6
6
October
1.3
2
2
3
2
November
-2.4
-1
-4
2
-1
December
-4.6
0
-9
-3
-2
Average
1.8
-2.2
2.9
2.4
2.9
2.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.8
18
4
6
7
6
February
10.1
15
12
6
5
3
March
6.0
3
15
6
1
7
April
5.9
6
6
5
1
6
May
4.8
5
7
4
7
June
3.0
1
9
4
4
July
0.6
0
1
3
0
August
0.5
1
0
0
0
September
2.8
6
2
4
1
October
4.4
13
0
3
2
November
6.0
5
11
5
5
December
6.5
8
13
11
5
Average
5.3
10.1
6.0
5.0
3.6
3.7
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
6.5
7
7
6
7
9
February
7.1
5
8
7
8
7
March
7.0
8
8
7
7
6
April
7.4
6
8
8
8
7
May
6.7
6
8
7
7
June
6.5
6
7
6
7
July
5.4
5
6
5
6
August
5.5
6
6
6
6
September
5.6
6
6
6
6
October
6.2
6
6
8
7
November
6.5
6
6
7
7
December
5.8
6
5
7
6
Average
6.4
6.5
6.3
6.3
6.8
6.6
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
236°
166°
161°
168°
205°
February
247°
263°
263°
283°
286°
March
233°
201°
294°
247°
295°
April
318°
267°
281°
330°
312°
May
333°
274°
323°
309°
June
319°
306°
319°
311°
July
338°
336°
335°
329°
August
324°
315°
332°
327°
September
326°
322°
324°
321°
October
299°
303°
239°
303°
November
230°
207°
203°
231°
December
205°
178°
220°
172°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.